Interest Rates and Central Banks: ECB and Fed

What you will learn

• The roles and mandates of the ECB and the Federal Reserve.
• What a policy rate is and how it affects other interest rates.
• Why expectations about rates often matter more than the decision itself.
• How an interest-rate difference can be cancelled out by a currency move.

Explanation

A central bank manages a currency and its monetary policy. Two of the most important for markets are:

• The European Central Bank (ECB), for the euro area. Its primary objective under the EU treaties is price stability. In its monetary policy strategy, the ECB defines this as 2% inflation over the medium term, and it treats the target as symmetric: inflation that is too low is seen as just as undesirable as inflation that is too high. Policy decisions are taken by the Governing Council.
• The Federal Reserve (the Fed), for the United States. Congress gave it the goals of maximum employment, stable prices and moderate long-term interest rates. The first two are often called the dual mandate. The Fed has said a 2% inflation rate over the longer run is most consistent with its mandate. Rate decisions are taken by the Federal Open Market Committee (FOMC).

The policy rate is the main interest rate a central bank sets or targets. For the ECB this is mainly its deposit facility rate; for the Fed it is the target range for the federal funds rate (the rate banks charge each other overnight). Policy rates influence many other rates, such as savings accounts, loans and bond yields.

In simple terms: when inflation is too high, central banks may raise rates to slow demand. When the economy is weak and inflation is low, they may cut rates. Current rate levels change, so always check the latest official figures on the central bank's own website.

Why rates move currencies: higher expected interest rates can attract investors who want a better return on cash and bonds. That can increase demand for the currency. But markets are forward-looking. If everyone already expects a rate hike, the price may already include it ("priced in"). The surprise is what usually moves the market: a decision, statement or forecast that is different from what was expected.

A hawkish tone means the central bank sounds more ready to raise rates or keep them high. A dovish tone means it sounds more ready to cut.

Worked example

Hypothetical example: a German saver has €10,000. A euro deposit pays 2% per year; a US dollar deposit pays 4% per year. Start rate: EUR/USD = 1.10. Excluded: fees, spreads and taxes.

1. Euro deposit after one year: €10,000 × 1.02 = €10,200.
2. Dollar route: €10,000 × 1.10 = $11,000. After one year: $11,000 × 1.04 = $11,440.
3. If EUR/USD is still 1.10: $11,440 ÷ 1.10 = €10,400, which is €200 more than the euro deposit.
4. If EUR/USD rises to 1.14 (dollar weaker): $11,440 ÷ 1.14 = €10,035.09, which is about €165 less than the euro deposit.

The higher rate attracted money, but a currency move of about 3.6% wiped out the 2-percentage-point advantage. Interest-rate differences matter, but they are only one part of the picture.

Common mistake

Practice activity

On paper: markets expect the ECB to keep rates unchanged. The ECB keeps rates unchanged but says future cuts are likely. Is this hawkish or dovish? Which direction would you expect for EUR/USD as a tendency, and why?

Key takeaways

• The ECB's primary objective is price stability (2% over the medium term); the Fed's goals include maximum employment and stable prices.
• Policy rates influence many other rates in the economy.
• Markets react to surprises and changes in expectations, not just to decisions.
• A currency move can erase an interest-rate advantage.

Next step

In the next lesson you will learn how inflation is measured and why real returns matter more than nominal returns.